Ansible playbook structure
- Playbooks are expressed in the form of YAML files
- Ansible Playbook structure Refer Here
---
- name: <name of the play>
hosts: <which hosts this playbook has to be executed>
become: <yes/no> # This will execute with root previleges
tasks:
- name: <name of the task>
<module-name>:
<module-parameter-1>: <value-1>
..
..
state: <value of the stated>
- Lets write a playbook to install lamp stack on ubuntu instance Refer Here
- Ensure Visual Studio code is installed on your machine and ansible extension is installed
- Refer Here for the first set of changes
- Lets apply the playbook
- Ansible has executed the playbook and it executes 1 extra task (Gathering Facts)
- Now lets try to install apache packages
sudo apt install php libapache2-mod-php php-mysql php-cli -y
- Refer Here for the changes done
- Execute the ansible playbook
- In the output changed represent ansible has done some execution to meet the desired state, OK means desired state is already met
- Lets execute the same playbook again, In this case there will no changed as the desired state is met as a result of previous execution
- So when ansible is executing it is trying to maintain the state.
- Now the next manual step is create a file, lets use copy the file from ansible control server to node
Refer Here
Deploying a tomcat application
- Steps:
#!/bin/bash
sudo apt-get update
sudo apt-get install openjdk-8-jdk -y
sudo apt-get install tomcat8 -y
sudo -i # become a root user
cd /var/lib/tomcat8/webapps
wget https://referenceappkhaja.s3-us-west-2.amazonaws.com/gameoflife.war
# Now navigate to http://publicip:8080/gameoflife
- Tip: Search the following in google
apt in ansible
-
Now to download the file google
-
Execute the playbook for yaml Refer Here
-
We Still need to understand
- How ansible is configured
- How ansible is executing modules on the remote nodes
- How can i make ansible work with different python versions.
- Playbook optimizations
-
Exercise:
- Install lamp stack on centos 7 Refer Here
